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Great lens!
I've had this lens for about 6 months now and I absolutely love it! Great buy! Even better price!
February 11, 2014

Super L quality
This is the second L lens I own, the first is the 70-200mm f4 L IS. After the first L, I just had to get another. The amazing quality that I've never had in any other lens, sets the L lens apart from all others. Smooth mechanism, great build and unbelievable sharpness! This lens is worth every penny I paid. The first time I saw an image at 100% on my monitor, I knew i had something special. Spot on auto focus, edge to edge sharpness...wide open. You can't go wrong with one if you need a long lens in this range! This prime won't disappoint!
July 31, 2013

Still deciding
I've shot with a 30D for about 7 years and recently switched to a 7D. All my digital SLR experience has been with these APS-C cameras. I purchased the 300mm IS f4L as a way to get a little more magnification than the 70-200mm IS f4L that I already had. With the APS-C format this lens performs similar to a 500mm (480mm), so it works well for bird and nature photography. I was hoping that the 'Prime' lens would out perform, or at least match, the great performance I experienced with my 70-200mm IS f4L. Although its performance can sometimes be great, especially close-up, at longer distances it produces slightly soft images more often than I would prefer. More often than not, I find myself gravitating back to the 70-200mm for its "Rock Solid" performance, rather than risking unsure results from the 300mm. My best results with this lens have been insects and small widlife shot at it's extreme close range end (5 feet+). I've recently purchased a 7D to replace my 30D and I'm interested to see if the 7D's 'Microadustment' feature can save this lens from it's spotty performance.
January 31, 2013

Have used this for years - great lens !
I 'm a female photographer and want to encourage other women to be bold and get into the field of wildlife work. I bought this lens when I first started wildife photography in 2000. I researched for months before buying. I wanted to photograph birds particularly. I'm a stickler about sharpness so I don't settle on my equipment. I love the hood, the scratch resistant coating and the sturdiness. I was once out in the field changing lenses on a picnic table. This lens rolled off and hit the ground. I was afraid it was damaged, but it didn't suffer. I have gotten some terrific shots of bighorn sheep and larger birds. The sharpness is fantastic. You can have great success photographing small birds if you're in a blind. I built myself one and have amazing photos of mourning doves and California Quail to name a few. If I don't have my macro lens with me and I have enough working room to get back from the subject, I can get wonderful macro close-up shots of bees on sunflowers with this lens. For increased distance, add a 1.4X Canon teleconverter. I find image quality doesn't suffer. But with a 2X, slight sharpness is lost. I did my homework on this one before buying and I'm glad I did. I have never regretted this purchase. Of course, I wish the cost had been lower and once in a while the focus gets confused in a multi-subject shot, but overall this is an amazing piece of equipment. I really don't feel the need to always have the tripod with me and that's worth a lot to me. I feel this is probably one of the best fixed telephoto lenses on the market. I find Canon equipment to be awesome overall. Good luck and happy shooting!
August 9, 2012